A six- to nine-month recovery is expected. However, Dr. James Andrews, who will perform the surgery, will also look to see if Hanrahan needs Tommy John surgery. If so, the elbow procedure would require an even longer recovery.
The Providence Journal reported that Hanrahan's tendon is "torn off the bone."
Hanrahan may have pitched his final game with the Red Sox as he signed a one-year, $7 million contract in the offseason.
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Toronto Blue Jays broadcaster Jack Morris apologized to Boston Red Sox right-hander Clay Buchholz a week after accusing him of throwing spitballs.
Morris, a 254-game winner, told ESPN Boston he spoke to Buchholz before Friday's game at Fenway Park.
Morris said last week after seeing video of the Red Sox 10-1 win over the Blue Jays on May 1, he was convinced that Buchholz was throwing a spitball.
Buchholz has denied the accusations.
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The Toronto Blue Jays placed outfielder Rajai Davis on the 15-day disabled list because of a strained left oblique muscle.
Davis sustained the injury during Friday night's loss to the host Boston Red Sox.
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Injured Los Angeles Dodgers ace Zack Greinke is targeting next week for his return to the rotation after making a rehab start Friday night for Class A Rancho Cucamonga.
Greinke, who is recovering from a broken collarbone, allowed eight runs and six hits with four strikeouts and no walks in 4 1/3 innings. Though the result was less-than-impressive, he had no setbacks, according to CBS Sports.
Greinke thinks he can start for the Dodgers on Wednesday against the Washington Nationals at Dodger Stadium. If he does, it would be a faster-than-expected recovery. He has been out since April 12 when he sustained the injury during a brawl against the San Diego Padres.
His altercation with Padres outfielder Carlos Quentin after hitting him with a pitch resulted in the injury.
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The Washington Nationals placed outfielder Jayson Werth on the 15-day disabled list with a strained right hamstring. Washington was also without outfielder Bryce Harper for the second straight game on Saturday after having an ingrown toenail removed.
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The Detroit Tigers activated relief pitcher Phil Coke from the 15-day disabled list. Coke has been out with a strained left groin since April 25. He has an 8.31 ERA in nine appearances.